2001 TOYOTA SEQUOIA engine

A23497
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak PressureON: Open
NegativeONON
Steps
(Reference)60 Within 15 minutes 10 60ON
First 0.02 inch
2/5 3/5 4/55/5
OFF: Closed
OFF: Vent ON: Closed
EVAP SYSTEM CHECK
sec sec sec
Normal Pressure
10
sec
1/5
Gross Leak
No Leak Small Leak
TimeLeak Pressure
Second 0.02 inch
StandardStandard x 0.2
DI±468
± DIAGNOSTICSENGINE
662 Author: Date:
2005 SEQUOIA (RM1146U)
3 Perform EVAP system manual operation check.
NOTICE:

In the EVAP SYSTEM CHECK (MANUAL OPERATION), the series of 5 EVAP SYSTEM CHECK
steps is performed manually.

Do not perform the EVAP SYSTEM CHECK when the fuel tank is more than 90% full because
the cut±off valve may be closed and making the leak check of the fuel tank unavailable.

Do not run the engine in this step.

When the temperature of the fuel is 35C (95F) or more, a large amount of vapor forms and any
check results become inaccurate. When performing the EVAP SYSTEM CHECK, keep the tem-
perature below 35C
(95F).
(a) Clear DTCs (see page DI±43).
(b) On the hand±held tester, select the following menu items: DIAGNOSIS / ENHANCED OBD II / SYS-
TEM CHECK / EVAP SYS CHECK / MANUAL OPERATION.
NEXT

A23499
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
NegativeONON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent ON: Closed
10
sec
1/5
Time
Pressure Sensor Noising
OK
Leak Pressure First 0.02 inch
Standard
± DIAGNOSTICSENGINE
DI±469
663 Author: Date:
2005 SEQUOIA (RM1146U)
4 Perform EVAP system step 1/5 check.
(a) Check the EVAP pressure in step 1/5.
Result:
DTCs*Test ResultsSuspected Trouble AreasProceed To
'Virtually no variation in EVAP pressureNot yet determinedA
P0451EVAP pressure fluctuates by
0.3 kPa
(2.25 mmHg) or morePressure sensor noisingB
*: The DTCs relating to the EVAP system displayed on a hand±held tester when checking.
B Go to step 30
A

A23500
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
NegativeONON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent ON: Closed
10
sec
1/5
Time
Vacuum Pump Stuck ON
60
sec
2/5
Leak Pressure First 0.02 inch
Standard
DI±470
± DIAGNOSTICSENGINE
664 Author: Date:
2005 SEQUOIA (RM1146U)
5 Perform EVAP system step 1/5 to 2/5 check.
(a) Check the EVAP pressure in step 1/5 and 2/5.
Result:
DTCs*Test ResultsSuspected Trouble AreasProceed To
'
Virtually no variation in EVAP pressure during step
1/5. Then decreases to 0.02 inch leak pressure
standard*
Not yet determinedA
P2402Small difference between EVAP pressures during
steps 1/5 and 2/5Vacuum pump stuck ONB
*: The DTCs relating to the EVAP system displayed on a hand±held tester when checking.
HINT:
The 0.02 inch leak pressure standard is the value determined in step 2/5.
B Go to step 23.
A

A23501
ON
Within 15 minutes
2/5
0.02 inch Orifice High±flow
Vent Valve Stuck closed
OK
0.02 inch Orifice Clogged
60
sec
3/5
4 sec
Vacuum Pump Stuck OFF
ONON
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Negative
Steps
(Reference)TimeON: Open
OFF: Closed
OFF: Vent ON: Closed
Leak Pressure First 0.02 inch
Standard
± DIAGNOSTICSENGINE
DI±471
665 Author: Date:
2005 SEQUOIA (RM1146U)
6 Perform EVAP system step 2/5 check.
HINT:
Make a note of the pressures checked in steps (a) and (b) below.
(a) Check the EVAP pressure 4 seconds after the vacuum pump is activated*.
(b) Check the EVAP pressure again when it has stabilized. This pressure is the 0.02 inch leak pressure
standard.
*: The vacuum pump begins to operate as step 1/5 is proceeded to step 2/5.
Result:
DTCs*Test ResultsSuspected Trouble AreasProceed To
'EVAP pressure in step (b) between ±4.85 kPa
and ±1.06 kPa (±36.38 mmHg and ±7.95 mmHg)Not yet determinedA
P043F and P2401EVAP pressure in step (b) ±1.06 kPa (±7.95
mmHg) or more
0.02 inch orifice high±flow

Vacuum pump stuck OFFB
P043EEVAP pressure in step (b) below ±4.85 kPa
(±36.38 mmHg)0.02 inch orifice cloggedC
P2419EVAP pressure in step (a) more than ±1.06 kPa
(±7.95 mmHg)Vent valve stuck closedD
*: The DTCs relating to the EVAP system displayed on a hand±held tester when checking.
B Go to step 11
C Go to step 30
D Go to step 19
A

A23502
ON
Within 15 minutes
2/5
Vent Valve Stuck open (vent)
3/5
ONON
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Negative
Steps
(Reference)TimeON: Open
OFF: Closed
OFF: Vent ON: Closed
Leak Pressure First 0.02 inch
Standard
DI±472
± DIAGNOSTICSENGINE
666 Author: Date:
2005 SEQUOIA (RM1146U)
7 Perform EVAP system step 2/5 to 3/5 check.
(a) Check the EVAP pressure increase in step 3/5.
Result:
DTCs*Test ResultsSuspected Trouble AreasProceed To
'
EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step
2/5 to step 3/5
Not yet determinedA
P2420No variation in EVAP pressure despite proceeding
from step 2/5 to step 3/5Vent valve stuck open (vent)B
P0451No variation in EVAP pressure during steps 1/5
through 3/5Pressure sensor malfunction stuckC
*: The DTCs relating to the EVAP system displayed on a hand±held tester when checking.
B Go to step 19.
C Go to step 30.
A

A23502
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak PressureON: Open
NegativeONON
Steps
(Reference)Within 15 minutesON
First 0.02 inch
3/5
OFF: Closed
OFF: Vent ON: Closed
Time Standard
± DIAGNOSTICSENGINE
DI±473
667 Author: Date:
2005 SEQUOIA (RM1146U)
8 Perform EVAP system step 3/5 check.
(a) Wait until the EVAP pressure change is less than 0.1 kPa (0.75 mmHg) for 30 seconds.
(b) Measure the EVAP pressure and record it.
HINT:
A few minutes are required for the EVAP pressure to become saturated. When there is little fuel in the fuel
tank, it takes up to 12 minutes.
NEXT

A23504
ON
Purge VSV Stuck Closed
4/5
ONON
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Negative
Steps
(Reference)TimeON: Open
OFF: Closed
OFF: Vent ON: Closed
OK
10
sec
Leak Pressure First 0.02 inch
Standard
DI±474
± DIAGNOSTICSENGINE
668 Author: Date:
2005 SEQUOIA (RM1146U)
9 Perform EVAP system step 4/5 check.
(a) Check the EVAP pressure in step 4/5.
DTCs*Test ResultsSuspected Trouble AreasProceed To
'
EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step
3/5 to step 4/5
Not yet determinedA
P0441
EVAP pressure increases by 0.3 kPa (2.25 mmHg)
or more within 10 seconds of proceeding from step
3/5 to step 4/5Problems in EVAP hose between pure VSV and
throttle bodyB
P0441
Variation in EVAP pressure is less than 0.3 kPa
(2.25 mmHg) for 10 seconds, after proceeding from
step 3/5 to step 4/5
Purge VSV stuck closedC
*: The DTCs relating to the EVAP system displayed on a hand±held tester when checking.
B Go to step 15.
C Go to step 12.
A

A23505
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
ON: Open
NegativeONON
Steps
(Reference)
ON
OFF: Closed
OFF: Vent ON: Closed
Time
60
sec
5/5
Leak Pressure First 0.02 inch
Standard
Gross Leak
Small Leak
No Leak
Leak PressureSecond 0.02 inch
Standard x 0.2
± DIAGNOSTICSENGINE
DI±475
669 Author: Date:
2005 SEQUOIA (RM1146U)
10 Perform EVAP system step 5/5 check.
(a) Check the EVAP pressure in step 5/5.
(b) Compare the EVAP pressure in step 3/5 and the second 0.02 inch leak pressure standard (step 5/5).
Result:
DTCs*Test ResultsSuspected Trouble AreasProceed To
'EVAP pressure (step 3/5) lower than the second
0.02 inch leak pressure standard (step 5/5)Not yet determined (no leakage from EVAP system)A
P0441 and
P0455EVAP pressure (step 3/5) higher than [second 0.02
inch leak pressure standard (step 5/5) x 0.2]
Purge VSV stuck open

EVAP gross leakB
P0456EVAP pressure (step 3/5) higher than second 0.02
inch leak pressure standard (step 5/5)EVAP small leakB
*: The DTCs relating to the EVAP system displayed on a hand±held tester when checking.
A Go to step 36.
B Go to step 12.